I am not sure how anyone would come to the conclusion the line is dead. Seems to me they make an announcement of a new figure just as the previous one is about to ship or is shipping. Jamie came up right about the time Jon was ready to ship out.
I would expect an announcement about the next figure right about when Jamie is supposed to ship. I would then expect the stated ship date of the next figure to be a pipe dream and it to take a lot longer than estimated.
Threezero went from not on my radar to suddenly having like ten licensed properties. I am only interested in GOT and Walking Dead although I have given up on Walking Dead at this point. Breaking Bad was an awesome show but I don't feel the need to add those guys to my collection. With so many fires in the poker, I think all of the lines suffer a bit. I have not even seen the remake of Robocop as the original is classic but they went and made a few things from that, Chappie, Halo, TMNT, Titanfall, etc.
This line is doing WAY better than Walking Dead. I think I am going to pass on WD even if more than Rick ever come out as at this point, I have committed to far too many properties as it is.
I would really love Night's King but would snatch up Brienne, The Hound, probably everyone they decide to make, even Drogo but I have very little interest in him at this point.